Frequency converter for an antenna



FIG. 1 is a top, front and right side perspective view of a frequency converter for an antenna showing my new design;

FIG. 2 is a bottom, rear and left side perspective view thereof;

FIG. 3 is a front elevational view thereof, the rear being a mirror image;

FIG. 4 is a top plan view thereof, the bottom being a mirror image;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a right side elevational view thereof. 

The ornamental design for a frequency converter for an antenna, as shown and described. 